Basically, you need to learn how uboot works, and how to use the uEnv.txt file. I wrote up a blog about booting from USB here: http://www.embeddedhobbyist.com/debian-tips/beaglebone-black/beaglebone-black-usb-boot/
Passed this, uboot has the "boot round robin check" hard coded in. Which I am pretty sure could be changed before recompiling. On Mon, Apr 21, 2014 at 5:36 AM, Gerald Coley <[email protected]>wrote: > My suggestion, and it is just a suggestion, would to read the System > Reference Manual. > > http://www.elinux.org/Beagleboard:BeagleBoneBlack > > > Gerald > > > > On Sun, Apr 20, 2014 at 10:17 AM, <[email protected]> wrote: > >> Hi, I want to change the boot order of the beaglebone black to USB disk-> >> eMMC->others. What topics should I study? I also want to remove the boot >> button. I want it such that whenever the U-Boot would search in the USB for >> linux image. >> >> Thanks. >> >> >> On Tuesday, October 29, 2013 10:21:09 PM UTC+8, Gerald wrote: >> >>> Correct. Unless you want to change the boot mode. >>> >>> Gerald >>> >>> >>> >>> On Tue, Oct 29, 2013 at 9:05 AM, <[email protected]> wrote: >>> >>>> So I should not input high,low either . >>>> I undertood. Thank you. >>>> >>>> 2013年10月28日月曜日 22時14分01秒 UTC+9 Gerald: >>>>> >>>>> A. The pins cannot float. They are already terminated on the board, >>>>> either hi or lo. >>>>> >>>>> Gerald >>>>> >>>>> >>>>> >>>>> On Sun, Oct 27, 2013 at 9:46 PM, <[email protected]> wrote: >>>>> >>>>>> Hi, >>>>>> Please tell me about correct circuitry to use boot pins as input, >>>>>> >>>>>> I use Beaglbone Black and want to use these pins, >>>>>> especially eQep counter pins P8-33,35,41,42 that match to SYS_BOOT >>>>>> 4,5,12,13. >>>>>> >>>>>> In SRM (ver A6) p104 it says, >>>>>> "If you plan to use any of these signals, then on power up, these >>>>>> pins should not be driven." >>>>>> >>>>>> Which of below is correct circuitry? >>>>>> A) Attach pins to ground until SYS_RESETn goes high. >>>>>> B) Keep pins floated until SYS_RESETn goes high. >>>>>> >>>>>> A is easier, because it can be done by switching 1 relay pulling all >>>>>> pins to ground. >>>>>> For B, I need plenty relays. >>>>>> >>>>>> Thanks, >>>>>> Tohru >>>>>> >>>>>> >>>>>> 2013年4月12日金曜日 4時20分23秒 UTC+9 DarkHelmet: >>>>>> >>>>>>> You can absolutely use them for other usages, once the value has >>>>>>> been latched at boot they can be re purposed It may be necessary >>>>>>> to strengthen the pull up/down on those lines with external resistors >>>>>>> though. I've encountered an issue where my TTL inputs were pulling the >>>>>>> lines low at boot while the CPU latched the config, preventing it to >>>>>>> boot >>>>>>> from the correct configuration. Resistors of ~50k seem to do the trick. >>>>>>> >>>>>>> On Friday, April 5, 2013 6:04:18 AM UTC-4, [email protected] wrote: >>>>>>>> >>>>>>>> Hi, >>>>>>>> >>>>>>>> I've a beaglebone with the XAM3359Z0Z, >>>>>>>> >>>>>>>> >>>>>>>> I discovered that there is 19 pins dedicated to the boot >>>>>>>> configuration. >>>>>>>> The documentation said that depending of the position of the >>>>>>>> switch, The beaglebone will boot with the sd card, uart, ..... . >>>>>>>> ( http://processors.wiki.ti.com/index.php/AM335X_StarterWare >>>>>>>> _Booting_And_Flashing#Boot_Modes) >>>>>>>> >>>>>>>> >>>>>>>> I wanted to know if it is possible to use these pins for an another >>>>>>>> usage? How ? I don't need an another boot mode, the default one is >>>>>>>> enough >>>>>>>> for me. >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> Thank you in advance for your help, >>>>>>>> >>>>>>> -- >>>>>> For more options, visit http://beagleboard.org/discuss >>>>>> --- >>>>>> You received this message because you are subscribed to the Google >>>>>> Groups "BeagleBoard" group. >>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>> send an email to [email protected]. >>>>>> >>>>>> For more options, visit https://groups.google.com/groups/opt_out. >>>>>> >>>>> >>>>> -- >>>> For more options, visit http://beagleboard.org/discuss >>>> --- >>>> You received this message because you are subscribed to the Google >>>> Groups "BeagleBoard" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> For more options, visit https://groups.google.com/groups/opt_out. >>>> >>> >>> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> For more options, visit https://groups.google.com/d/optout. >> > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
